Improvement in sawyees  rules



@uiten gisten' @anni @fitta THOMAS CARTER, 0F LOUISVILLE, KENTUCKY.

Letters Patent No. 71,979, dated December 10, 1867.

IMPROVEMENT IN SAWYERS RULES.

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To ALL wuoM 1T MAY ooNcE'arI;

Beit known that I, THQMAS CARTER, of Louisville, in the county of Jcierson, and State of Kentucky,

have invented a new and improved Sawyers Rule; and I do hereby declare that the following is a full, clear,

and exact ldescription thereof, which will enable' others skilled in the art to make vand use the same, reference being had to the accompanying drawings, forming part of this specification. This invention relates to an improved sawyers rule, and consists of a rule on which is a scale, showing at a glance the number of board 'or plank, of any desired thickness, which can be s'awn from a log of any given diameter. In the accompanying drawings-'- Figures 1 and 2 are reverse views of a rule twelve inches in length and three inches in depth, having my scales marked thereon.

Similar letters of reference indicate corresponding parts.

I do not claim the rule itself, or any ordinary scale thereon, or subdivisions thereof. My rule may-be of any dimensions, and will be graduated accordingly. It may be constructed of wood, brass, or any suitable material.

M'y graduations may be the only ones on the rule, or it may contain my graduations in addition to those ordinarily used, or any other scale or subdivisions. The size rule which I believe will be found most conven-l ient, is thirty inches by three. -The graduations are of such a character thatthe outside slab oi the log being supposed removed, the diameter of the log being ascertained and read oii, the column of inches, marked A, say 9, if it be desired to ascertain the number of planks of onehali` inchv thickness which can'be cut from such log, the number lin the half-inch column, z'.e., in the column marked D, directly over the figure V9 in the column A, gives the 4'required number, viz, 12. The number of planks, respectively one and one-quarter inch, two inches, and two and three-quarter inches, which can 1re cut from a nine-inch log, is in like manner found by reading from columns F, I, and M respectively, the numbers respectively directly over the figure 9 in column A, viz, 6, 4, and 3, respectively. So from a log teu and a half inches 1in diameter, .the number of plank ofthe respective thicknesses of one-half, ve-eighths, one and one-quarter, one and one-half, and three and onequarter inches respectively, 'will be found inthe ycolumns B, C, F, G, and O respectively, directly over the 10i line on the Vernier scale o'f column A, viz, 14, 12, 7, 6, and 3 respectively. 'The numbers 3, 3%, 4, 5, 6, 7, 8, 9, 10,11, 12, 18, 14, 15, 16, and 17, across the rule atthe head of each column, and to the left ofthe letters B C D E F G H I K L M N O I Q R, respectively indicate the number of turns to be given to the screws after each cut to bring the log into position for the next cut. Thus, cutting planks say one and one-hali` inch thick, seven turusor revolutiousare to be'given to the screws of the log-carriage, after cutting each plank` to bring the log into position for the next cut, and five planks one and one-half inch thick will be got from a log eight i and three-quarter inches in diameter. So thirteen turns cut planks three inches, seventeen turns, four inches,

as seen from the scale. The scale cm'ployedvma'y be decimal instead of fractional, and the columns will be adjusted accordingly.

I claim as new, and desire to secure by Letters'Patent- 1. A scale so constructed and adjusted that any two of the three quantitiesof-the thickness of the planks, the diameter ci' the log, ahd the number of the planks cut or to be cut from the log being given, the third of said quantities is read off from the scale in the manner substantially as above set lforth and described.

2. A scale. exhibiting the number of turns to be given to the screws of thelog-carriage for cutting plank yor boards of any desired thickness.

THOMAS CARTER. Witnesses z Ltorn HARRIS,

t J. G. Downme.

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